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Note 12 - Accrued Closure Costs and ARO (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
Amounts in thousands |  |  |  |
Balance as of December 31, 2014 |  | $ | 5,508 |
Accretion expense |  |  | 299 |
Payments |  |  | (331 | )
Adjustment to closure liability |  |  | (175 | )
Balance as of December 31, 2015 |  |  | 5,301 |
Accretion expense |  |  | 374 |
Payments |  |  | (693 | )
Adjustment to closure liability |  |  | 2,333 |
Balance as of December 31, 2016 |  | $ | 7,315 |
Schedule of Asset Retirement Obligations [Table Text Block] |
Amounts in thousands |  |  |  |
Balance as of December 31, 2014 |  | $ | 2,870 |
Amortization of closure and post-closure asset |  |  | (152 | )
Adjustment to closure and post-closure asset |  |  | (143 | )
Balance as of December 31, 2015 |  |  | 2,575 |
Amortization of closure and post-closure asset |  |  | (760 | )
Adjustment to closure and post-closure asset |  |  | 2,333 |
Balance as of December 31, 2016 |  | $ | 4,148 |

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